9-Fluorenone-1-carboxylic Acid is primarily used in organic synthesis as a building block for the preparation of more complex molecules. It serves as a key intermediate in the development of pharmaceuticals, particularly in the synthesis of compounds with potential therapeutic properties. Additionally, it is utilized in the production of dyes and pigments due to its ability to form stable, colored derivatives. In material science, it is employed in the creation of organic electronic materials, such as semiconductors and light-emitting diodes (OLEDs), owing to its conjugated structure. Its applications also extend to research and development, where it is used as a reagent in various chemical reactions to study reaction mechanisms and develop new synthetic methodologies.